Twig 2 compatibility
Twig 2 compatibility

The `Twig_NodeInterface` interface is deprecated in Twig 1.x and will be
removed in Twig 2. Changing `Twig_NodeInterface` to `Twig_Node` should
make the extension ready to support both Twig 1 and Twig 2 for now.

asm89/twig-cache-extension,asm89/twig-cache-extension,DenisMedved/twig-cache-extension,DenisMedved/twig-cache-extension